Then going elsewhere will just delay the inevitable. If we can't survive here, where it's still rather lush, then good luck where it's fucking bleak in comparison.. where just about everything we have there we will have brought from here, and where our current behaviour would end the adventure even quicker than it might on Earth.
"Endless growth" is the strategy of a virus, or of cancer; if you *need* endless growth to just survive, something is super fucked up. What is destroying our planet and our society is supposed to save us? Yeah, right.
I completely agree. We shouldn't be thinking on how to move to another place where life will be more difficult. Although hard, it would be easier to change the way people behave now.
Besides, who would go to the other planet when earth is devastated? The richest 2% who could afford it, who by the way are the ones who have heavily contributed to earth's pollution?
Where will they be going anyway? To a hospitable environment like Mars or Europa? Good luck with that.